92 Transactions. — Zoology. 



beyig free lialf-way up the crest, and others more or less free to the crest itself. 

 The lower process of the atlas, or first, entirely wanting ; that of the second, 

 large, thick, but compressed and truncated at the end, but probably in process 

 of growth about as j^rominent as the upper process of the first. The lower 

 process of the third, well developed, elongate, sti'aight, much compressed, and 

 truncated at the end ; about one inch shorter than the large process of the second. 

 The bodies of the fourth to the seventh vertebrae without any indications of 

 inferior lateral processes. 



The bodies of the third to the seventh vertebrte, very thin, not much more 

 than half the thickness of that of the first dorsal vertebra, wliich is anchylosed 

 to the last cervical vertebra. The neural arch and upper lateral process, which 

 is similar in form to that of the last cervical vertebra, but much thicker and 

 stronger, is entirely free. The articulating surface of this vertebra is nearly 

 circular, being only a little wider than high. The front of the neural canal is 

 nearly circular, but rather depressed — that is, a little wider than high, but 

 regularly rounded. The canal at the hinder end of the vertebral mass is larger, 

 rounded, but with a rather ti'iangular top, and a little wider than high. 



The first rib has a single head, and is wider at the sternal end. 



The sternum is oblong, rather irregular in shape and thickness, being 

 thicker on one side than the other, yevj spongy or rather — full of cylindrical 

 tubular cavities. There are three convex cylindrical prominences of nearly 

 equal size, placed without any apparent order, on its thick mai'gin. It is rather 

 curved, the surface is flat, but the lower one is rather distorted by the unequal 

 thickness of the bone. It is 6 1 inches long, and about 5 inches wide. 



The scapula is triangular, with a rounded end, rather bi'oader than long — 

 that is to say, 25 inches high and 27 inches bi"oad at the widest end. The 

 front margin has a broad compi-essed acromion process, which is bent towards 

 the articulating surface and acute at the end, with a large arched outline 

 which occupies about half the front margin. The disk of the outer surface is 

 concave, with a large concavity in the middle of the upper half The inner 

 surface is nearly flat. There is no doubt that this bone is in process of 

 development, for the terminal edge is very thick and truncated. 



Macleayius australiensis. 

 Macleayius australiensis, Gi-ay, Cat. Seals and Whales, p. 105, figs. 



10 and 11 ; p. 371, figs. 74 and 75, from Kreff't's photographs. Supj^l. 



Cat. Seals and Whales, p. 46. Synopsis of Whales and Dolphins, p. 2. 

 Inhabits Australian seas (Krefi"t) • coast of New Zealand (Haast). 

 Skeleton in the British Museum. 



